656743 has 4 divisors (see below), whose sum is σ = 658368. Its totient is φ = 655120.

The previous prime is 656741. The next prime is 656749. The reversal of 656743 is 347656.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 656743 - 2¹ = 656741 is a prime.

It is a super-2 number, since 2×656743² = 862622736098, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a d-powerful number, because it can be written as 6³ + 5⁷ + 7² + 6⁶ + 4⁴ + 3¹² .

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

656743 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 330 + ... + 1192.

It is an arithmetic number, because the mean of its divisors is an integer number (164592).

2⁶⁵⁶⁷⁴³ is an apocalyptic number.

656743 is a deficient number, since it is larger than the sum of its proper divisors (1625).

656743 is an equidigital number, since it uses as much as digits as its factorization.

656743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1624.

The product of its digits is 15120, while the sum is 31.

The square root of 656743 is about 810.3968163807. The cubic root of 656743 is about 86.9224217055.

The spelling of 656743 in words is "six hundred fifty-six thousand, seven hundred forty-three".